Is it possible to take a wildblood line and a normal bloodline when taking the cross-blooded archetype? For instance, could I take the Marid bloodline and the rime-blooded wildblood line?
Nope.
No, because the archetype rules say none of the alternate class features can replace or alter the same class feature from the class as another alternate class feature. Because the crossblooded and wildblooded sorcerer archetypes both alter the bloodline arcana and bloodline powers, they aren't compatible archetypes.
Note that it is certainly within the GM's purview to allow this combination. However, the character should not be able to use the crossblooded archetype's ability to select a lower-level bloodline power that was replaced by the wildblooded archetype. For example, a wildblooded brutal (abyssal) sorcerer replaces "strength of the abyss" with "wings of the abyss" at 9th level; the character has "paid" for the wildblooded archetype by giving up "strength of the abyss," and can't use the crossblooded bloodline to select "strength of the abyss" as her 15th-level or 20th-level bloodline power.